
body {
    body {
     background-image: url('poster.jpg'); /* 这里的 'poster.jpg' 是相对于项目文件夹的路径 */
     background-size: cover;
     background-position: center;
 }
 
     font-family: Arial, sans-serif;
     display: flex;
     flex-direction: column;
     align-items: center;
     justify-content: center;
     height: 100vh;
     margin: 0;
 }
 
 #wheel {
     position: relative;
     text-align: center;
 }
 
 #canvas {
     border: 2px solid black;
     box-shadow: 0px 0px 15px rgba(0, 0, 0, 0.5);
 }
 
 button {
     margin-top: 20px;
     padding: 10px 20px;
     font-size: 16px;
     font-weight: bold;
     cursor: pointer;
     border-radius: 8px;
     border: none;
     background-color: #28a745;
     color: white;
     transition: background-color 0.3s;
 }
 
 button:hover {
     background-color: #218838;
 }
 
 #history {
     margin-top: 30px;
     background: rgba(255, 255, 255, 0.8);
     padding: 10px;
     border-radius: 10px;
     box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.3);
 }